The first day of Facebook CEO Mark Zuckerberg’s Congressional testimony -- and the awkward moments it bred -- gave rise to countless memes and viral tweets. But the tidbit currently delighting the internet has nothing to do with the senators who grilled the 33-year-old Facebook founder for nearly five hours on Tuesday.

Washingtonian first noted on Tuesday that Zuckerberg’s chair was outfitted with a thick extra cushion, which was reportedly supplied to him by Congress. The internet...